<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
        .father {
            width: 100%;
            height: 60vw;
            background-color: pink;
            display: flex;
            justify-content: space-between;
            /* 多元素换行 */
            flex-wrap: wrap;
        }
        
        .father div {
            width: 20vw;
            height: 20vw;
            background-color: orange;
            border: 1px black solid;
        }
    </style>
</head>

<body>
    <div class="father">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
        <div>9</div>
        <div>10</div>
        <div>11</div>
        <div>12</div>
        <div>13</div>
    </div>
</body>

</html>